严格带限超宽带信道中能量捕获的理论分析
Theoretical Analysis of the Energy Capture in Strictly Bandlimited Ultra-Wideband Channels
摘要：
无线通信信道的频率选择性可以通过信道脉冲响应的延迟扩展Ds来表征。如果延迟扩展与输入信号的带宽W相比很小，即Ds*W近似等于1，则信道表现为平坦衰落。对于Ds*W >> 1，信道表现为频率选择性的，这通常是宽带信号的情况。在第一种情况下，精度远高于采样时间T = 1/W的小尺度同步是至关重要的。在本文中，它是由分析手段，这是不同的宽带制度。这里，具有精度T的同步是足够的，并且小规模同步不能进一步增加接收器处的捕获能量。仿真结果表明，对于IEEE 802.15.4a信道模型，这种效应在W > 50 MHz时已经发生。
英文摘要：
The frequency selectivity of wireless communication channels can be characterized by the delay spread Ds of the channel impulse response. If the delay spread is small compared to the bandwidth W of the input signal, that is, Ds*W approximately equal to 1, the channel appears to be flat fading. For Ds*W >> 1, the channel appears to be frequency selective, which is usually the case for wideband signals. In the first case, small scale synchronization with a precision much higher than the sampling time T = 1/W is crucial. In this paper, it is shown by analytical means that this is different in the wideband regime. Here synchronization with a precision of T is sufficient and small scale synchronization cannot further increase the captured energy at the receiver. Simulation results show that this effect already occurs for W > 50MHz for the IEEE 802.15.4a channel model.
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